This attribute indicates that a transaction is needed and will be started by the method if one is not already present.

此属性表示需要一个事务，并且如果事务不存在，则由方法启动。

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If a transaction is already running, the bean method will join in that transaction or the Spring lightweight transaction manager will start one for you.

如果事务已经在运行，那么bean方法会加入事务，否则Spring的轻量级事务管理器会启动一个事务。

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However, if one public update method invokes another, the transaction owner may not have control of the rollback logic in some circumstances.

然而，如果其中一个公共更新方法调用了另一个，那么事务所有者在某些情况下可能无法控制回滚逻辑。

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